Hi Kirsten,
that is what I was going to recommend, too.
If you have lots of spectra you could do it with a little macro like this for each spectrum:
get('SP:hsqc_old').referenceValues = get('SP:hsqc_new').referenceValues
If the referencing Points have changed, too, then you’ll also need an equivalent line like this:
get('SP:hsqc_old').referencePoints = get('SP:hsqc_new').referencePoint
And if you have systematically renamed your spectra (e.g. the new spectra have the same names as the old ones, but with _new at the end) you could wrap it all in a bit more Python to do everything in one go:
for sp1 in project.spectra:
for sp2 in project.spectra:
if sp2.name == sp1.name + '_new':
sp1.referenceValues = sp2.referenceValues
sp1.referencePoints = sp2.referencePoints
Vicky