It can be figured out, but not by a simple formula. If you want the two bikes to feel the same, we have to get your saddle into the same position on both bikes, and the saddle to bar reach to be the same.

The 1.5 degree seat tube angle change will result in a saddle setback change of about 1.7 cm, assuming your saddle height to BB is 68.5 cm (close to my setup). With the shallower seat tube, you'll need to position your saddle 1.7 cm farther forward to get your knee to BB relationship the same as it is on the steeper bike.

The difference between top tubes is 1.1 cm. With the shallower-angle frame, you'd need a top tube 1.7 cm longer with the same stem to put your hands where they are on the steeper bike. A stem that is 0.5 cm longer than on the steeper bike would get your reach about the same as you have now.

The reduction in head tube angle in the shallower frame will move the front wheel farther away from the BB, I think it will be more than a centimeter. This will reduce any tendency for toe overlap with the front wheel. This will have a very small effect on the handlebar clamp position.