Comparison of gene expression time series in vitro and in vivo
Direct comparison of the course would be difficult between tissues and cultured cells. In stead of time scale, you might want to use markers. 
For example, Kislinger et al. show the expression peak of SIX1 is 2 days after differentiation; SMAD3, 4 days. I am not a right person who can tell which markers are good, but I believe you could find more information by literature search.

http://www.mcponline.org/content/4/7/887.full