Defender 130 Model History

Hi, I wondered if anybody could help me.

I've been looking at 130's and I see that some have the extra length between front and rear doors (presumably giving more leg room to rear passengers), whilst others have a similar body to the 110 meaning the extra length is in the load area.

Is this an option or is it related to time of production?

Any information appreciated.

thanks.

Neither of those are UK built factory vehicles. They may not even be 130s, but extended to 130 (or whatever) by 3rd party converters.