i believe that triggers are interchangeable, but not sure on that. i know the model 7 trigger is adjusted the same way the 700 trigger is...
action strength... i guess technically the 700 is stronger because it is beefier, but i seriously doubt you'd ever note a strength difference in a lifetime of shooting.
the model 7 and 700 scope mounts do not interchange, nor do their stocks. the 700 is significantly larger in the rear of the action area. also, i think the space between the trigger and recoil lug is different... but not sure on that...
for feel, i really like the feel of the model 7 shamus (rsaum family). seem to be a great blend in weight and balance. the 700's would be 2nd, and the regular 7's would be third to me. seems the regular 7's, while the weight is perfect, i wish it would be centered out towards the muzzle just a little more than it is.
i have a few 700's and 7's... and since remingtons are on sale locally, plus you get a $50 rebate from rem for buying shamus, guess what i'm picking up tomorrow?? yep, model 7 shamu in 300 rsaum (so i can run direct comparisons to the 300 wsm i already have...).