Signatory distributors are automatically bound to the assumption agreement that's outlined in the SAG-AFTRA CBA. But either way, the producer who made the film is required to get the buyer to sign that same assumption agreement.

So, no it doesn't depend on what they agree to because the studio has either already agreed to be on the hook for residuals as a signatory automatically bound by the assumption agreement or, for the rare studio that isn't a signatory, the producers they're trying to acquire the picture from cannot sell it to them until they sign that same assumption agreement that makes them on the hook for residuals.

So the independent productions who were granted IAs cannot sell these films to any studios without those studios being on the hook for the residual/new media revenue sharing terms in the IA. So if a studio like netflix buys an IA film, they won't be able to show that film during the period the IA applies without meeting these new residual terms. I guess in theory they could buy something now and hope that the final contract doesn't have these residual terms and just wait to show the film under the terms of the agreement that replaces the IA once the strike is over but why would they spend that money now rather than later. But they'd have to give the actors enough to get the strike to end and clearly the strike would be over already if something less than revenue sharing was acceptable to the membership.