I've just done a quick google of inside an ambulance. I found these pictures from NORCAL (Northern California Ambulance) and when looking at these, the MJ Ambulance pic looks pretty outdated.
Below: You can see in this pic that it's taken from the POV as if it were the paramedic who was assisting Michael. You can see that all the equipment next to where the patient would be lying is completely different and much more advanced.
Below: And you can see here where the picture would have been taken from the small side window just behind the cabin. Again, the equipment looks a little outdated.
Now, I don't really know about this kind of stuff but surely if any of the Ambulances were outdated then they wouldn't be used? All equipment would be upgraded, no?
I could be completely wrong and it could be a simply case of it simply being different equipment used in different ambulances but it doesn't hurt to ask.
And also, from what I've heard, Paps regularly waited outside Michael's home (aswell as the FF's who were regularly outside his house) so they could get pictures of him coming and going so if this is the case, why are there no pictures of the ambulance going
in to the house?