Dingo Tone seems to have around a 50% success rate. When it works, it's fine, but by all accounts it seems very sensitive to temperature and humidity (or it maybe that different batches end up with different properties) and if they aren't in just the right window when applied, it can take ages to go hard. Sometimes it just stays tacky for ever.

If you still want to use it I'd definitely test it on some scrap wood first (use all the coats and let dry between each coat) before applying it to the guitar.

And yes, use the same finish on the maple board as on the back of the neck (regardless of what finish you chose to apply).

Your timbermate is pretty dark. The main grain pattern lines are also pretty close together, which is making it look even darker. For a good Springsteen butterscotch finish, you'd really need a different body, ideally swamp ash with a much wider-spaced grain pattern so there's a lot more basic wood and less grain. And maybe have used a lighter colour Timbermate. For more authenticity I'd use an amber tint nitro spray as well for the colour, not stain.

Why not give up on the Springsteen Esquire look for this one and concentrate on making the most of what you have? The next one can always be the Springsteen one.