Bonne année! 😀
Yes, the MatriX implementation is different depending on what you have connected. In short:
SEQ v4+: grid editing modes, also per track/303, or select a pattern, basic keyboard mode with velocity on the y axis, sliders can be assigned to CC
LoopA: note editing with pan and zoom, note entry with length and velocity, macro screen with single-key shortcuts, track volume etc., flexible isomorphic keyboard with adaptable row interval), force-to-scale selection page etc.
The features are demonstrated really nicely here: