Lantus/Protaphane

Can anyone tell me the difference between Lantus and Protaphane - other than most people are now prescribed Lantus. Reason for my question is because I commenced Lantus 13 months ago when my blood sugar levels (BSLs) skyrocketed to the 30s (in Australia, at most, they should not go over 10) due to a serious tooth infection. Since then, my BSLs have been everywhere from 1.1 to 51. Then a month or so ago, whilst in hospital again (I have spent about 7-8 months out of the 13 months in hospital), I saw a new Endocrinologist who changed me from Lantus to Protaphane and my BSLs have settled, under 10.