Difference in Query informations/counters between SQLdm and Query Store Reports

can we trust the counters given by SQLdm? For the same query, the figures given by SQLdm are very different from those given by the Query Store. 
For the occurance, SQLdm returns 21 and the Query store report returns 997 and that for the same period.
Or "execution count" cannot be compared to "Occurences" in SQL dm ???