cells of bone and cartilage tissues

[mieuses]

I have a problem in distinguishing between blasts and progenitor cells in cartilage and bone tissues under the microscope.now here's the situation:
what I think I know:differentiation is a gradual process and so distinguishing between similar-looking adjacent cells of a growing tissue is not possible by mere appearance(like osteogenic cells and osteoblasts)
problem:which are osteoblasts,chondroblasts;and which are osteoprogenitor,chondroprogenitor cells?I've had some conflicts on this while looking into multiple references.help please?

[rihannapark]

Those two might have some similarity but definitely functions in different way; chondroblast forms the cartilage while osteoblast forms the bone. Both played a significant role in bone development. Chondroblast found in the lacunae present in the groups of two or more and the osteblast located in the deeper layer of bone marrow.

[mieuses]

I'm sorry there's been a misunderstanding,what I meant to say is I need to know -in bone tissue-how to distinguish osteoblasts and osteogenic cells.and -in cartilage tissue-which are chondroblasts and chondrogenic cells