How much earlier than Lemon Zest is Po Pyu Kalay?

[birngerd]

I am trying to decide on a third mango tree for my yard. I currently have a Cotton Candy and Maha Chanok. Seeing as how the Cotton Candy is late-ish and Maha is a mid season (with a longer season than most), I am considering getting a PPK mango as an early-ish variety to extend the season a bit. I have access to free budwood from a friend's LZ tree though, so I wasn't sure if it'd be worth it to buy the PPK if the season isn't too much earlier than LZ (which I've heard is mid-season). As far as I understand, the bacterial spot problem present in South Florida hasn't reached my area in Tampa, but I may be wrong about that.