If you're referring to the POS Jack-In-The-Box extruder that comes with the 6 do yourself a large favor and replace it with something that will let you see what is going on: https://www.amazon.com/Creality-Official-Upgrade-Extruder-Filament/dp/B08F23ZNTG/ref=sr_1_1_sspa?crid=TUQUZHZY03IQ&keywords=cr6+se+metal+extruder&qid=1652806421&sprefix=CR6se+%2Caps%2C89&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExSzFEV0FCTjVKSjU3JmVuY3J5cHRlZElkPUExMDQ0MDg1MVFNS1ZBMFk4TUpZTCZlbmNyeXB0ZWRBZElkPUEwMjA5MzA4RTREWUM5NEZVWlpGJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
Yes MK8 parts will work. I have a cr10S which is the same as yours but upgraded in some areas. I bought this one in red and works great.
Creality Official Upgrade Extruder, MK8 Extruder Alloy Block Bowden Extruder 1.75mm Filament for Ender 3 Series, Ender 5/5 Plus/Pro, CR-10 Series 3D Printer https://www.amazon.com/dp/B08F23ZNTG/ref=cm_sw_r_cp_api_glt_fabc_EDMRD3P589W5T0BCN4XB?_encoding=UTF8&psc=1
this seems to have high marks and I decided to order one.