Thought I'd introduce myself, been lurking (just reading not posting) for about 10+ years now

As a child I played the DOS version exclusively really (my brother owns it) but in the last 10+ years I've been playing the Windows version on and off on Linux (via Wine - with complete success I'm happy to report).
I have been using the ISO found inside 'TTD_WIN95.rar' that orudge links to here... viewtopic.php?t=3407
But thought recently I ought to really legitimise this a bit, since even the DOS version I have is technically my brothers anyway. So I took a gamble and spent £20 on Amazon (the seller was St. Michael's Hospice). I normally hate buying off Amazon as you never know if what you'll get even remotely looks like the picture of the stock item shown... but to my surprise...
Shrink wrapped and everything! :S
Now the question is... should I dare open it?
Can anyone tell me if the ISO I've been using from that RAR is 100% identical to the disc I'd find inside?
Thanks
Steven