The paint that was used inside Panzers changed during the war. During part of 1944 the entire interior was left red oxide (RAL 8012) but the compaints came so thick and fast from crews that it was changed after about a month.
Officially it should be RAL 1001 Elfenbein.
We have to be careful as the modern RAL 1001 IS NOT close to what the original wartime colour.
Vallejo have RAL 1001 in their Model Air Range which is 71.075. I don't know if it is thr original wartime shade though.
I do think that the AK colours are out by quite a way as they use the scale correct policy and some of their Panzer colours never existed or were used!
However, not all is lost as it is time to do the paint tests and sacrifice whire plastic spoons to the great paint goddess!
Now, Mid 1944, Panthers, Tiger I and II started using RAL 9002 as the interior colour after the red Oxide debacle!
Of course, this is mitigated by factories having different paint suppliers and this muddies the waters further.
I would look at 70.075 first as I think the online shade card doesn't reflect the actual colour.
Other colours you can look at is:
71.132 RAL1015
71.119 RAL9002 Grauweiss - usually seen in late war Panzers. This is also the same colour as the S-100 German schnellboots were painted. It is also known as Schnellboot Weiss.
RAL9001 Weiss - this is an off white.
While I have no actual physical references to prove this, I think that these colours would be good as representative of the original colours and shade differences between manufacturers and batches.
the interior of hatches were sometimes painted with the exterior base colour, but this is not set in stone and was usually a unit field decision and applied at the company repair depot.
Interior equipment such as gearboxes, engines etc were not usually painted white, but a field grey/green or grey/blue. I have those RAL colours somewhere in my notes.
PLease don't paint Ammunition brass as the Germans from 1933 used parkerised steel for their ammunition cases. These were painted different colours including green, copper, silver, bronze grey, gold but were not painted bu ammunition type!
I would be interested as to what you have from Takom. I should also do some paint tests myself on these colours!