I can't tell the difference between pipa and guzheng. Who knows how to distinguish accurately? Thank you.

I played the pipa and guzheng. I think the sound of pipa is thin and bright, and it feels a little sharp. The sound of guzheng is more vigorous and mellow, and the music of guzheng generally gives people a more gorgeous feeling than pipa. The sliding sound of guzheng is more characteristic and the lingering sound is longer. In some tunes, many guzheng tunes use flower fingers, that is, several strings are plucked continuously from bottom to top, and all of them are pentatonic, which is an acoustic effect that is not found in pipa. There is also a sound similar to running water in guzheng music. If it's a plucked ensemble, pipa mostly plays melodic things, while guzheng is often in the bass part.