Shower hardware replacement

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Are the internals the same for all?

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The valves will be completely different among brands

Are you changing out everything or just the trim kit (IE tubspout, handles, etc). If your just changing the trim kit it needs to be same brand. If your changing out everything it doesn't matter because your changing out everything and it comes with trim, valve body, valve etc.

As mentioned, the mixing values will be different. The tub filler should just unscrew and you would screw on the new one, unless it’s a different length. Some plumbers use a copper stub out that’s sautered at the 90°, out the wall, from the mixing value so that might get a little technical if you need to adjust length.

If you don’t plan on demoing the shower, you can cut an access on the rear of the wet wall to access shower valve. Be aware that the existing shower valve is most probably anchored to some dead wood that will need to be surgically removed. Before you can cut the valve loose and reattach new value.

Make sure you purchase a value with the same number of functions.

Depending on valve size & how much play you have with the pipes, you might need to offset the water lines a bit so if you’re going to cut an access, make sure it’s larger enough. You can Amazon almost any size access panel to finish off the hole you’ve cut. I’ve also made them afterward with scrap plywood and 1x.

Good luck!

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Plumber guy over the weekend said that GB was actually Delta but branded for Home Depot. Not sure if that is true or not.

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That is not what the google is telling me.

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No, Glacier Bay and Delta are not the same brand. Glacier Bay is a proprietary, budget-friendly brand owned by Home Depot, while Delta is a distinct, higher-quality manufacturer. While some Glacier Bay products may copy Delta designs or use similar, interchangeable parts, they differ significantly in material quality, durability, and price.

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Glacier Bay is a private-label brand owned exclusively by The Home Depot. These budget-friendly faucets are manufactured by various third-party suppliers, primarily including overseas manufacturers like Globe Union Industrial Corp and Lota International, which produce the items in China, Taiwan, and Israel.

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You better make sure that delta handle fits that Glacier Bay mixing valve first. I'm not sure trim kits fit across multiple brands.

I'd just swap out the valve as well. Delta is much better than GB. I'd suggest buying your new Delta from a plumbing supply house, and not Lowes or HD.

Cheaper components in the faucets from big box. More plastic vs brass.

Supply houses and big box rarely sell the same model #'s. Very similar but you're going to get more plastic with the big box. But do as you see fit....from a family of plumbers I've put both in. For my own home I will not install a faucet from home depot/lowes.

I am still not exactly clear on what you mean by “hardware”

Are you replacing the whole faucet or just some components of the faucet, showerhead or drain?