The colors of glowing text on Java Edition don't match the ones seen in the Bedrock beta.
While on Java the colors are generally brighter, which makes sense, some of them lose fidelity (such as dark green, cyan and light blue).
On Bedrock, the colors are closer to the new palette introduced in the World of Color Update.
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Can confirm this in both 1.17.1 and 1.18 Pre-release 2. I've attached a side-by-side comparison of the textures in java edition and bedrock edition.
I did not test this on Bedrock Edition, but I can confirm that in Java Edition the text on glowing signs is much brighter compared to the text on Bedrock.