Connecting one pair of speakers to two amps? Is it possible?

So recently I bought my first stereo system which includes a record player, two speakers and a Pioneer SX-450 amplifier. I've borrowed some records and it sounds really good, looking forward to purchasing my first ones. I also have a LG sound system (SJ4R) since before which I purchased with the TV. The LG sound system consists of two surround-speakers, a soundbar, a subwoofer and an amp. Only the surround-speakers are connected with copper conductor to the amp, the rest is wireless.

What I'm wondering is if there is any way to connect the surround-speakers to both the SX-450 and the amplifier that came with the sound system?

Thought that I could use the same wire and simply connect it to both but I read that that is highly disapproved since one of the amps could be fried.

Any advice on what I can do? I'm a newbie when it comes to audio gear and would like to learn more.