G16 7620, ram upgrade

Yes;  the CPU controls the clock speed, so whatever it is at present, it will be with any upgrade.  Installing faster RAM will result in the RAM downclocking the speed supported by the memory controller aboard the CPU (which in turn cannot be upgraded).

Crucial indicates that your laptop supports up to 64 GB of RAM. Here are Crucial RAM kits guaranteed to be compatible. For example, if you want to use 64 GB, here is a Crucial 64 GB matched pair kit of two x 32 GB sticks.

Maximum clock speed is 4800 MHz. While you may be able to install faster RAM, it will downclock (run more slowly) to the maximum speed that your laptop supports. So, buy 4800 MHz RAM, unless faster Crucial kits are somehow cheaper or more readily available. Intel's specifications for your processor confirm a maximum of 4800 MHz for DDR5 RAM.

Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard.