Let’s make it clear: you can have however many citizenships and passports, as long as the 90/180 rule applies to you, it applies to you, not each of your citizenships or passports separately.
So, no, coming back on a different passport does not reset anything.
Yes, it will be harder for a border official to determine whether you are or aren’t within your allowance, as currently the only simple way they have is to check stamps in your passport and count the days, so like if you renewed a passport, they will only get part of the picture.
But if they become suspicious for whatever reason, dig a bit further, and find out your other passport or find traces of your presence in Schengen via other means, then you could be in big trouble. Not only could you be turned away immediately, but you may have difficulty ever coming back.
Of course this will become a lot easier for them once the forever-delayed EES and ETIAS come into force, but even before then, it’s just not allowed.
But in any case, 3 weeks and then another week sometime later is well within the 90/180 limit, with months to spare.