Ask for the offered assembly identities and combined mass, centre of gravity and relevant inertia information for the intended movement. Have each supplier include the complete carried arrangement, rather than adding a loose-tool total to an unrelated part calculation.
Then the second has not defined the assembly it is claiming suitable. Who chooses and assesses that customer-supplied adapter, and is its cost included anywhere in your comparison?
Also ask why the finger lengths differ. They may be solving different fixture-access problems, so a lighter total will not necessarily describe an equivalent transfer.
Has either supplier shown release and withdrawal at the receiving fixture, Ella? The complete movement views should accompany the complete load information before you choose.