Change of size of markings on Bf.110 nightfighters

[Hans Nauta]

Dear all,

When did the Geschwader markings on Bf.110 nightfighters change from normal size to small size and when did the black crosses change to white crosses?

I expect it differed from unit to unit when this occured, but perhaps there is some time frame? Somehow I guess it may be end 1943, however I hope one of the experts can help me out.

Thanks in advance,
Hans Nauta