Malt differences?

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If a rye recipe asks for rye malt (diastatic or non diastatic) how much of a difference does it make if one uses a wheat malt?

If diastatic, then it makes no difference.

Non-diastatic is for flavor (and color), big difference. As big as in wheat or rye malt extracts in beers.

I suppose if non diastatic is called for it'll alter the flavour profile but will still be tasty. 

Is pale rye malt diastatic or non diastatic?

A while ago I made malt from spelt grains. I happen to have a bag of wheat grains which i'm thinking of malting to use in rye breads. Guess I can't go wrong if I just stick to the same amount using wheat malt instead. 

As @mariana stated, pale rye and wheat malts have about the same diastatic power (≈100–120 °Lintner). Not surprisingly, the rye malt has twice the α-amylase power (40 vs 20) than the wheat malt.