ALM syncing when multiple developments are happening

DeveloperCYT

We have 2 developers working on the same model in different modules.
One has completed his changes but the other is not ready to sync.
Unfortunately you have to sync the whole model, and this means partial changes would then be synced. If the first developers' changes are urgent, waiting for a major change to be finished is unproductive.
Would it be an idea to just sync the changes (by choice), and not the whole model?