Originally Posted by Iride01

You might have an issue with the front DR. But since you already got the crank all you have to do is slide the old crank out of the BB and put your new and older crank in. Then you'll know if it works. Though I suspect your shifting on the front won't quite be right. And that fix will involve a front DR compatible with the old crank and a old STI that will cost as much as your old crank you bought.

The cable pull ratio of the STI's are different between 4700 10 speed and the older 10 speed and earlier stuff. 4700 stuff is compatible for the most part with the 11 speed Shimano group sets. Though there are some things that won't go together.

But if the chain ring spacing is the same between the two cranks then you should be good.