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Connecting two chimes with built in transformers to the same push is not a good idea. They would need to be connected so that booth transformers are phased together, and not one 180 degrees out from the other, and unless the voltages of the transformer secondaries are identical, there will be a constantly circulating current through the two chimes, which may make them buzz. you could probably solve this with a couple of blocking diodes, but then the chimes might not perform as intended.
You can connect two chimes in parallel with a transformer by the CU, as long as that transformer can supply sufficient power to supply your chosen two chimes.
You can connect two chimes in parallel with a transformer by the CU, as long as that transformer can supply sufficient power to supply your chosen two chimes.