Given wrong implant: Natrelle Inspira 265cc full profile vs 275cc Mod profile. What's the difference? Should I ask for revision?

The difference between the two implants is not very big.  In some patients who have sufficient breast tissue, you may not notice a difference at all... that being said, remember that a small asymmetry is normal, no two breasts are identical and if you think you have a small asymmetry now, having the implant exchanged for the other one may still leave you with some asymmetry.  That's normal.  So consider if you really want a revision.

The first thing you should do is talk to your surgeon to find out why you given a different implant from the one that was originally planned. While the difference may not be readily apparent, it's better if you discuss this with your surgeon. I also recommend you wait until about 4 months after surgery before you assess your results. You may like what you see and stick with the implants that you've been given. Best of luck.

I would suggest that you discuss with your surgeon - there may well be a very logical and reasonable reason why your surgen used the implants she/he did.  If not, I would suggest you allow the healing process to play out and realistically evaluate your results at 6 months - I suspect that you will likely not need or want a revision.  

I am sorry to hear about the concerns you have after breast augmentation surgery.  The difference in breast implants  that you mention in your question are probably not noticeable clinically. Your plastic surgeon will be able to tell you why he/she made the decisions that he/she made; most likely the decision had to do with implant selection based on intraoperative measurements (dimensional planning).  As you know, it is much too early to evaluate the outcome of the procedure performed and/or the need for revisionary breast surgery. I would suggest that you occupy your mind and be patient during the recovery process.  Evaluate the results of the procedure performed 6 months from now. Best wishes; hopefully you will be very pleased and not be concerned about revisionary breast surgery.