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Toolstation ony appear to stock the 'White',
although Soudal manufacture Black, Grey, Alu Grey, Brown & Beige,
which may be available from other suppliers.
The Tech data sheet does ask for a minimum of 2mm width 'for bonding'
and 5mm 'for joints'.
How little is your 'little movement'?
I ask as 1mm is 'little' and easily accomodated by sealant in a 5mm wide joint.
1mm movement in a 2mm wide joint is likely to result in failure,
either cohesively or more likely adhesively, whichever sealant you use.
The Toolstation adjacent item 61252, Fix All Crystal
is a 'Clear' sealant based upon the same Soudal SMX polymer, if you require clear.
That looks like exactly what I need to fill the small gaps between my stair treads and wall which are subject to a little movement.
Does it dry white or clear?