[Closed] Bottom bracket question. Road bike.

Evening
I'm looking to replace the bottom bracket on my kaffenback,so was having a look on planet x's website. There are two 105 bottom brackets on there at different prices,but from the picture they look identical. They have the same product code except one has b at the end. Is the b just code for black,and they have just used the same picture for both brackets?
I've emailed them and they say both brackets are identical,which seems odd to have different prices on the same item.
I've also had a look on shimano techdocs,but I couldn't find what I was looking for.
Anyone on here know please?

Ta