ᐅ Ikea Rationell H or B drawer slide system

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

Thank you in advance!
Freixen

H Hettich, B Blum and I Manuex.

Thank you very much for the quick help! 😀