Hi ELW
Welcome to the forum
I think Masaledar is a Punjabi term, meaning spicy, tangy, full of flavour etc...
Punjabi run BIR's can be quite different to Bangladeshi BIR's
but I'd hazard a guess it's Tandoori mix or Jal mix that gives it it's flavour and colour.
The few Punjabi restaurants I've been in, all you can eat, buffet style
tend to have the same background taste to all their curries.
I might be wrong but I've always put that down to Bassar Mixed Powder.
If your trying to replicate a Pakistani curry, it follows you use their spice mix.
Amchoor Powder is a secondary spice and I suppose It will be used Chef dependent.
The three google reference's to "Raan Masaledar" are the identical recipe

cheers Chewy