Can i use eSIM on an incompatible phone?

I bought myself a smartwatch (Huawei watch 3) and a large reason for it was to use it without my phone.
Now i learn my current phone (p30 pro) does not have eSIM compatibility.
Can i activate my current SIM on a phone that does have it, like a samsung galaxy s20, and then carry over that activated SIM back to my old phone. I imagine it should still work since its the same number and same SIM?

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