It is sequence and product dependent, but yes in certain combinations I also get most Soundcore products to connect to two devices at once. I have to connect the lowest / oldest version of bluetooth first, typically a laptop, then newer / same version. I get the most reliability if I alter the connection with phone to be calls only.
It’s not officially due to work but with some practice I usually get to work.
Example, the wired Slim buds, they are a product from about 3 years ago, I connect at the same time to my tablet for media and my phone for calls. Not meant to work, but does.