Well, it's quite a jump. While you have the basic framework for proj mgmt, there are many differences. For instance, construction validates quality by inspection, whild IT involves testing, and testing of various types. For instance, there's functional testing, meaning you test what you build, but there's also regression testing, which tests whether the addition you just made (and tested in functional testing) happened to break anything else. For an analogy, if you're putting an addition on the house, you need to insure that adding the new electrical circuits didn't overload, weaken, or break any existing circuits. In addition, you will be inexerienced at estimating activity durations, and will need to rely completely on the team for these estimates - that might not be completely bad, as sometimes PM's underestimate times or the skill factors of their project staff.
Wow, it's quite a jump. I suggest, if you can, that you be an assistant PM working with an experienced IT PM for the first few projects. At least that way you'll know what you don't know and can focus on building skills in those areas.
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The trouble with doing something right the first time is that nobody appreciates how difficult it was - Steven Wright