Are expressions return the same queryset?

I am using django ORM.
Are next expressions return equal querysets?

q1 = Model.objects.filter(field1=foo, field2=bar)
q2 = Model.objects.filter(Q(field1=foo, field2=bar))
q3 = Model.objects.filter(Q(field1=foo) & Q(field2=bar))
q4 = Model.objects.filter(Q(Q(field1=foo) & Q(field2=bar)))

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