Jack... I do see your point, but I don't think that minor variations in defining and phrasing basic assumptions constitute a significant 'difference'. When they are enough different, they usually are reflected in schicisms... and thus different religious churches, sects, etc.
I suppose it just comes down to how you want to define categories... if you have only 2-3 basic ones you have one viewpoint, but if you have many sub-headings under each one the whole 'feel' of it all changes.

I once knew a woman who called herself "Buddhist", but whose beliefs about karma and life forms was more like Jainism. She was an example of what we both may be referrring to, but are reaching different conclusions about. (I have no idea what she thought about 'creation'.)

Don T has expressed the situation pretty well.