The best place to check full specs out is with the link below. You can check both phones with a search.
https://m.gsmarena.com/samsung_galaxy_s21_5g-10626.phpI would add though, that the S21 support for software will end with Android 15... this year is the last Android release. The phone will continue to function but won't get any further OS past this upcoming release. Security update will be a further year.
To make it a worthwhile upgrade, personally I would consider an upgrade to the S24 or S23 series, and the jump a couple of years in the specs and support would future proof you for longer.
Foe info the s24 uis getting 7 years of updates, and the S23 I think is four.
Either of these will give you ongoing support far longer than the S22 upgrade that you suggest.
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