Exactly. If you're using LDAC, the data send to the WF-1000XM4 will be identical. The DAC/Amp circuit inside the WF-1000XM4 will be used then, so the sound will be the same.If using BT LDAC Best with say an A55 vs 1AM2/1ZM2 should it be same to some Sony WF-1000XM4? (with Sony Music App).
Off course wired connections will differ.
Of course, the same with an Computer or an Smartphone