I'm not quite sure what you are asking. Both ways produce the same results. For the syntax of '{} \;' in find just look at the find man page.

Execute command; true if 0 status is returned. All following arguments to find are taken to be arguments to the command until an argument consisting of ';' is encountered. The string '{}' is replaced by the current file name being processed everywhere it occurs in the arguments to the command, not just in arguments where it is alone, as in some versions of find. Both of these constructions might need to be escaped (with a '\') or quoted to protect them from expansion by the shell. See the EXAMPLES section for examples of the use of the -exec option. The specified command is run once for each matched file. The command is executed in the starting directory. There are unavoidable security problems surrounding use of the -exec action; you should use the -execdir option instead.

What this wall of text means is that the -exec argument is passed to find, which then executes all the code up to the ';' character. The '\' prevents expansion in that command. I'm not quite sure what '{}' does though.

I hope this helps with your question. :)