I wish I knew,
On the combo het;
I don't even know if they both work to create their colouration by creating the same leaky gene.
If they were maybe you would get an intergrade like a more intense lavender albino.
Or of it was a different gene or result on the same gene if you would get a shaded candy.
Or they could knacker the genes altogether and produce a regular looking albino phenotype.
On the dual homozygous;
The same results could be true mentioned above I think.
I'd love to be involved in finding out one way or another that's for sure.
dr del