Hello
Pretty much everything is interchangeable from an external point-of-view; shock and swingarm for sure.
Don't forget that it's better to have a working Sachs shock than a knackered Ohlins... so budget getting any second-hand shock serviced (around £75) if you're going that route. The Sachs will work but won't offer the same range of adjustment that you get with an Ohlins. A Showa shock from a base model should be plenty good enough for the road and track anyway if it's setup correctly.
The black swingarm and later body revisions are probably worth more from a visual appeal though, imho.