In order to apply the styles for larger or  smaller font sizes, you can follow the steps  below:

1- Select the text layer you want to use from the original PSD file

2- Go to Layer menu -> Duplicate Layer 

3- Under "Destination" choose "New" from the drop down menu next to the word "Document". This will create a copy of the layer in a new file

4- Now go to the new file you've just created, make sure that the style text layer is selected, go to Image menu -> Image Size

5- Type in the new Width and Height you want, and make sure that the "Scale Styles" checkbox is checked (at the bottom of the Image Size dialog box)

6- Once you hit OK, the styles will be resized according to the new dimensions you typed, and now you can continue working with your document, or copy the resized layer style and apply it to any other text layer you have.

7- To copy a layer style, simply Right Click on the layer -> Copy Layer Style, then go to the layer where you want to apply the copied style, Right Click -> Paste Layer Style

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