You will probably have to adjust your seat (if you are picky like me). I upsized from 172.5 to 175 and had to lower my seat a few mills.
I had 172.5 on my road bike and when I went to build up my TT bike, I bought some used 175's on ebay. I liked them so much I decided to get 175's when I upgraded my group.
But really the difference is miniscule. The percentage change between crank arm length is so small compared to other measurements. I was told to try to keep all your cranks the same length between bikes so they all feel the same. But obviously it doesnt apply to track bikes since your crank length is pretty much determined by how steep the banking is.