I have 2 different carts I am using

1 is a live site with 1.3.7 and the other is a test site using latest 1.3.9

The test site is where I am making all my changes with add-ons, customizations etc...

I plan on moving this all to the Live site when I am done.

On the test site I am using a test database and not the live one.

I would like to change my configures on the test site to use the database of the live site but cannot do that because of the live site using an old database version 1.3.7

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So my question is this:

Can I just upgrade the database on the live site without new pages being added/updated without any adverse effects?

Any thoughts on this?