Layshaft bearing 6203TB.P63

I have this as a replacement for my layshaft, and several posts indicate Mick Hemming's recommendation is a 6203TB.....so, what is the .P63 suffix
designation? Is the 6203TB.P63 bearing the same as Mick's?

I think it may be an old bearing from what I can tell, the ".P63" is a combined precision and clearance, as far as I can tell the P6 part is now the standard precision and the 3 part is a C3. The T is a laminated phenolic textile cage, the B is also part of the cage design. I just got a roller bearing for mine instead.