Question about different MDMA

[JKLJKLJKL]

Right, SWIM has had two quite different experiences on MDMA, this is MDMA as a powder, which SWIM snorted.
The first time the MDMA was orangey brown and crystal like in quality, after having a couple of lines, the experience was breahtaking, having only had coke (which SWIM thought was overrated) and pills which had never amde him feel like this. SWIM felt the happiest he ever had felt an spent a fair few hours rolling around on the floor so content being in his own skin that he couldn't believe it. Topping up every now and again sustained this for about 7 hours.

SWIM's second experience was when the MDMA came almost as a rock, though it crumbled easily, it was whitish brown in colour, and looked more like pills than the previous MDMA SWIM had had. Anyway, a couple of lines of this did next to nothing, a couple more and SWIM started to feel a bit of a "high" similar to a good ectsacy pill, but nothing more, and it went away quite quickly.

So SWIM's question is, what do you think the difference was... was the second MDMA of a lower quality, cut worse and the first one more pure.
or was the second one more pure, and the first MDMA cut with something else - perhaps Ket - would explain why we were rolling on the floor not really wanting to move for ages.

Interested to hear other people's experiences.