No, Sunday Sounds patches can't be used in GarageBand. These are patches for MainStage or Logic Pro.
Sunday Keys Version 2
Using the Tonic Pad Player
Getting Started with Sunday Keys for MainStage
Troubleshooting Sunday Keys for Ableton
What Gear do I need?
Troubleshooting Sunday Guitar
My Song-Specific Patch is Different from the Demo
Customizing Your Song-Specific Patch
My instrument/controller isn't connecting