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[Doctor Gollum]

Plugs are the same, difference is the loom length 

[laney101]

Unfottunetely the stickers were no longer on mine so wouldnt have known.

Im gonna tomorrow there in the right way around haha jist incase ...

AH is the front sensor, and BG is rearmost.
You could just check the ones fitted and replace with the same.
I'm certain (although its a while since I changed one) that the plugs will be different to avoid incorrect fitment.
And yes it does matter which sensor goes where, as their function is different - GM wouldn't have had two different sensors if it didn't matter!!

[Doctor Gollum]

You'll figure it out, just don't take all four off at once... 

[johnnydog]

If you decide to go the Ebay route, last time I checked, a BG sensor was listed with one seller under the correct Bosch number, but the generic / stock photo on the listing showed a sensor with the AH tag.
Worth, in my opinion, confirming with the seller that you are getting the correct sensor before purchase...

[deviator]

also coolent temp sensor

This and again this. There are 2, 1 for gauge, one for ECU, you want the ECU one. I would only trust a genuine part for this, but last time I bought one, it was £12.

I can not stress this enough, if this sensor is dead, it fails leaving the ECU thinking it's cold, cold engine = add more fuel.

Plugs are the same, difference is the loom length 

Again this. The sensors are the same, the cable length is different as they are in different places on the exhaust.

[Ulap31]

I think this is probably the problem that the sensors are either on the way out or are wrong. I changed 2 from fleabay so I'm thinking that I'll change all four for the correct ones.