Hi, have been using Adobe to get started in stock, spent the year uploading and am finally now seeing the rewards, sales are picking up nicely. However, I wish to use Shutterstock too and have recently started uploading to them too.

Is there a way to use existing, previously signed Adobe releases for Shutterstock?

I asked on the Adobe forum but was told to use Easy Release, apparently both accept it. That's fine going forward but doesn't help me retrospectively.
I don't want to contact any models all over again for a second set of releases.
And Easy Release is fine if I remember to ask the model there and then. It is limited if I forget at the shoot or more likely, decide to submit a picture some months afterwards and the model is remote from me. Both Adobe and SS allow for remote digital signatures.
Grateful for any advice.