class Foo(models.Model):
    start = models.DateTimeField()
    end = models.DateTimeField()

from django.db.models import F

Foo.objects.filter(start__year=F('end__year'))

SELECT "foo"."id", "foo"."start", "foo"."end" FROM "foo" WHERE django_datetime_extract('year', "foo"."start", 'UTC') = ("foo"."end")

from django.db.models import F
from django.db.models.functions import ExtractYear

Foo.objects.annotate(start_year=ExtractYear(F('start'))).filter(end__year=F('start_year'))

SELECT "foo"."id", "foo"."start", "foo"."end", django_datetime_extract('year', "foo"."start", 'UTC') AS "start_year" FROM "foo" WHERE django_datetime_extract('year', "foo"."end", 'UTC') = (django_datetime_extract('year', "foo"."start", 'UTC'))