I have been using for ages
-CCI LR BR2 for the .30-06
-CCI LR Magnum for the 7 mm Rem. Mag.

but, unfortunately, they are not available anymore where I live.

I bought RWS 5333 and RWS 5341.
Question: may I use the same powder load or have I to decrease by ,5-1 grs it?

Unless you are pushing the envelope or above the standard book loads I wouldn't change a thing.

primers matter when it comes to accuracy [shrug] if you don't care about that then swap away and have at it.

few months ago a bought 1000 GINEX LR PRIMERS. so far they have been good, very accurate... but hard to push in new hornady brass

The .30-06 and 7mm RM are hunting calibers. I doubt a change in primers will effect hunting accuracy so drastically that rounds will not be usable for a successful hunt.

Hip

This is not quite the direct answer to the OP's question but may be of interest to handloaders comtemplating a forced change to primers different to their favourites and wondering if new loads need to be worked up. I had to buy White River Energetics LR Primers here due to unavailability of Federal 210 Primers so did this small test comparing the two. I haven't seen mention online of WRE Primers in the USA but assume they are available there. This test was done just a few days ago. I originally posted this to a website here in NZ and have copied and pasted here.

Comparison of Primers: Federal 210 vs White River Energetics LR
In another post referencing both these primers I said I would do a little test to compare them. I did that at a range today, shooting a couple of my usual loads in a Sako M591 .243W and Tikka T3 30.06 Both rifles are Left Hand bolt actions.
The .243W load I use quite frequently while the 30.06 load I have used several times and will probably discontinue when those particular bullets are used up. Knowing both loads I have an expectation of how they should shoot. The only component difference was half of each batch had either the Federal 210 or White River Energetics LR primer. Each shot was Chronographed through my new Garmin unit and the velocities noted. I alternated shots of each load so a Federal was followed by a WRE each time. If you follow the hole numbers on each target that shows the exact shooting sequence. After two shots the rifle was rested for 5 to 10 minutes allowing barrel cooling until shooting again.
It was a humid day with little breeze and while there temps went from 20 to 28 degrees Celcius.









Federal Primers - left, WRE Primers - right


And just for @grandpamac , yes, I did shoot one fouler shot first in each rifle before commencing the test



I didn't shoot terribly but I know the .243W particularly is capable of better. But the result is what it is - good enough.
For the 30.06 I think shots 1 and 2 are likely flyers with the barrel settling as fouling returns. It wasn't spotless before I commenced shooting but probably needed to be more fouled than it was. Disregarding shots 1 and 2 the group is more typical of how this load shoots.

My observations and conclusions:
No great POI difference. In fact, remarkably similar.
Almost no average velocity difference associated with either primer.
Suggests to me either primer is likely interchangeable for numerous loads.
From this test and one earlier test with the same 30.06 a slight possibility that WRE Primers may ( sometimes ? ) produce slightly tighter groups. Would need a lot more shooting to verify.
White River Energetics LR Primers are every bit as good, possibly a smidgen better even, as Federal 210 Primers.
Hereafter I have no reason to not continue using WRE Primers in any LR primed load.

Just a comment on the Garmin Chronograph Xero C1, a really compact unit. This has now replaced my Caldwell solar unit and as I trust the newer technology more I take the Garmin readings as the more accurate. I found today Av. Velocity of 3098 fps for the .243W load whereas I had this noted as 3234 fps as recorded from many shots through the Caldwell. Likewise with the 30.06 load I had an Av. Velocity of 2834 fps via the Caldwell against 2767 fps with the Garmin. It's no biggie as these loads shoot well but just thought the comparison might be interesting.

I hope this is helpful to anyone wondering about the White River Energetics Primers. Please come in with any thoughts and comments you have.
Cheers