What matters as much as anything is your actual saddle height and your preferred saddle to bar drop. Compare the total head tube length (with the headset) of you current frame to the proposed new model to figure out what must be done with the stem angle and spacers.

The 55cm has about 15mm less reach than your current frame and the head tube is 175mm, plus about 15mm for the headset. The 52cm has a reach that's another 15mm shorter and the head tube is 30mm shorter.

If you saddle height is around 76cm, to go with that inseam, then the 52cm would have a really short head tube, that would only be suitable if you can tolerate a ssaddle to bar drop in the 8-10cm range and a 30mm longer stem.