Two "Different" Rectifier Tubes in Pair OK???

I bought two different tubes from two different sources. Both claim they were Ken Rad 5U4G - and they are. However, internally,they're different. Will this be an issue???? I guess I can just try it and hear for myself but, didn't know if there's be any harmful consequences:

Would pix of the internal structure or Date codes be useful to anyone?

thanx