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No, everyone in heaven is not equal because of the diversity of their merits.
The degree of closeness to God in heaven depends on one's merits. The Council of Florence, under the authority of Pope Eugenius IV (1431-1447), defined the dogma (DZ 693) that
the souls of those, who โฆ are immediately received into heaven, โฆ see clearly the one and triune God Himself just as He is, yet according to the diversity of merits, one more perfectly than another.
Since the Blessed Virgin Mother has the greatest merits, she is the closest to God in heaven.
Also, one cannot merit in purgatory. Since people die with a diversity of merits, so is there a diversity of merit in heaven.