2D rotate with A/B source switch

I need to do a 2D rotate of a JPG with an A/B source switch to a second JPG at 90 degrees.

I can do it with two separate comps and make the switch on the edit timeline but it is messy.

I can't find a way to do the A/B source switch on the fusion page.....

If they're the same size, just load the two jpgs and merge them on top of each other. When it's time to make the switch, animate the blend of the merge and you're good to go.