Why do the -02A1 and -02A power supplies have different color wires?

iMac EMC 2134

So my 24" iMac went "pop" and stopped working a week later.

I opened it up, and quickly saw that a MOSFET on the supply went ka-boom. So I ordered a new power supply.

Old one is PA-3241-02A Rev A

New one is a PA-3241-02A1 Rev A

So I went to install it. Started connecting it up, and realized that one of the connectors (the AC power input, I guess, because the others are DC output, LCD inverter, and temp sensor) has different color wires going to it.

So, if I plug it in, Blue goes to Brown, and vice-versa. I'm no electrical tech or engineer, but this strikes me as something worth investigating.

Looking at the power board, the component that this is plugged into (a fuse, I gather, because it says T5A 250V on it) is also installed backwards from one supply to the other.

So before I plug this in, explode the iMac, and burn the house down, I figured I'd ask if this was a problem, or should I just let-er-rip?

Thanks