It's that 'about' word that worries me.

The number stamped on the bottom of the club is the spec that the head manufacturer was aiming for. The tolerance is +/- 1°. In other words, if your 2i is supposed to be 19 and your 5w 18, it could actually be that they're 20 and 17, respectively.

The other thing will be that your 5w is a little longer, adding a touch more speed (so a touch more distance). This is what makes hybrids an interesting game - their CoG is more back and low like a FW, but they're short like irons. However, loft is the trump card in the distance game. The reason one iron is longer or shorter than the other is due to loft, not length. So I'd buy a hybrid with a loft that matches your 2i, and expect a higher ballflight and the same distance.

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True Length Technology Fitter - www.truelengthtechnology.com
It's live! - www.ShipShapeClubs.com
PCS Class 'A' Clubfitter

A new highlight: Golfing the home course on Christmas Day.

I say it too often: If it's golf club shaped, you can play with it.

For the record, I'm a club doctor, not a swing doctor.