I agree with Lazz on #1 with the bronze leaves, but I see a new flush on #2 and it is not bronze, also see a flower and it is not purple--it may be mandarin.
Just a guess, but #3 is probably not kumquat, flowers look too big as well as leaves--seems to be blooming a little early for kumquat as well.
#4 could be kumquat, but the fruit will tell. If it is Nagami, fruit will be oblong, if miewa, the fruit will be round.
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Skeet