As was said, it does vary by individual - first and foremost that is the case.
However, while this is true.. there are underlying similarities as muscle function is identical in all.
For example the soleus is predominantly slow twitch fibre.. as it is in rats too! This is due to the function of it.
Gastrocnemius fibres are a higher proportion of fast twitch for the most part, but then of course a sprinter will have more fast twitch fibres in the gastroc than Paula Radcliffe.
So yes - there are basic generalisations you can train with.
The fibre 'type' is not just about the fibre itself, but also related to the motor unit that innervates it. IIRC there are studies that show that motor units can change type and this affects the fibre type.
I would have to get out a big book to confirm that - but if memory serves me correctly this is the case.
In the most general sense - lower body fibres tend to be slower than upper fibres - of course this is not exclusive (what is?) - as the medial deltoid is slower twitch and at least one of the 3 muscles of the Hamstrings are faster (due to their role in sprinting of course).
Logically it is load bearing muscles that are going to be slower twitch - they are 'at work' more often so need the oxygen (slow twitch fibres being 'oxidative' fibres).
Of course when it comes to training - you need to do both.
i would suggest doing high rep (15-20) sets for a couple of months - followed by a couple of months of lower rep (5-9) and see what muscles responded best.