Other than the diffrence in handels. Are the Rem 600 series bolts the same length as the bolt for the 700 short action. Or the model 7 bolt?

Any other diffrences?
Than you in advance.

The model 600 bolts are the same length as the XP-100. They are shorter than the 700 SA.

The 600/660 bolt is the same length as the Model 7 and the XP100. Newer Remington bolts have a slot in the right lug, older ones did not. A slot can be cut in an old bolt if needed to install in a newer receiver.