Ikea Rationell H or B drawer slide

Good day
I have offered my Faktum drawers on an online auction site and was now asked whether these are RATIONELL H or RATIONELL B.
From a forum post here, one could read that H stands for Hettich and B stands for BLUM.
Can someone confirm this for me? *BLUM is stamped on my slides*

Thank you very much in advance!
Freixen

H Hettich, B Blum and I Manuex.

Thank you very much for the quick help! :D