The Core clock is 100Mhz higher, but the turbo boost is 300Mhz higher.
If all four cores are being utilized, the i5 4570 will probably be 200Mhz higher at most.
This will basically mean for RAW power it may be ~7% faster. This will probably not be noticeable for you.
If you can get the it 4570 for ~$10 more though it would be worth it.
You won't have to worry about any overheating issue unless you're encoding media constantly, or other super number crunching applications.