Can two projects of AC 800F be compared to check whether they r same or not if not what r the differences
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To check whether two projects are same or not, incase of version 2013 you can goto project manager and check these information project version (with time and date) and size. check image below, if both projects are same both info will match between two projects.
Incase its not same, There are several approach,
easy way is run plausibility check and compare project tree nodes of red\yellow\pink color.
to find code level changes,it is 15-30 min task but to confirm any difference upto code.
Open both the projects( freelance allows to open two frames in same pc) and compare project tree/resource/tasks/PL/FBD it appears with count so easy to analyse if there are any changes.
to find changese inside FBD open it and check highest number of process sequence of block, if its not matching there is addition\deletion of blocks. check image for find process sequence.
variable list and tag list you can export in csv and compare files using file compare tools google it.
follow good project\engineering habits\practices,to never come across these questions, like take always backup of last latest project version. and keep log of that.