Are all 4 wire narrow band lambda sensors the same?

[Sensibleboy]

Apart from wire length and the connector plug how can narrow band lambda sensors differ from each other?

I have a 206 GTi running on an Omex 600 ECU. it uses a single standard Peugeot Bosch lambda sensor with a non standard AMP Superseal connector to attach it to a custom loom.

So rather than pay a lot for another Bosch sensor for a 206 which I will then need to cut the plug off to fit a Superseal plug, what's there to stop me buying a universal lambda sensor that's much cheaper?

[Sensibleboy]

Excellent, lots of responses. I was looking at the ECP lambda sensors and it says some are for post and pre cat but I guess that's simply down to the connector that's fitted to them to make sure they are connected properly.
So it looks like I have some options then. Thanks guys!