[Closed] sizing and understanding coil spring specs

I currently run a VanRC with a 350lb x 2.37" spring fitted (thanks to Loco) on a Remedy

I understand that the 350lb is the spring rate (and that's fine)
and the 2.37" is the amount of travel.
The whole spring is 12cm long (4.72")

Now... if I want to fit a different spring, such as a ti one, what specs are valid/equivalent? I want the same spring rate (350lb) as I'm happy with that.

- will, say a 350x2.5 be okay?
- are all springs 12cm long?
(the shock body could handle a longer spring)
- would a 2.5 actually result in more travel? (maybe a daft question....)
- would a 2.5 change how the bike rode (sag, feel, geo etc.)?
- are all ti springs of the same spec, the 'same'?

If there is an online resource that would be handy.