The Spitzhaubens I got were almost the size of Leghorn chicks but 1/8 of the size of the red sex links. They do look a little more delicate but they will make up for size at maturity. They lay medium sized eggs, not large or jumbo eggs so it looks like the right size of egg they would be hatched out of.
they are very small but I don't know those breeds, hope they make it,I have a very tiny self blue (lav) silkie that I got for my replacements and I thought for sure it wouldn't make it because it was half the size of the other silkie chicks but it it doing great and growing like a weed.They are so very cute.