Yes, as to concussions that blog article summarizes:
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Most concussive injuries in football are due to head-to-head contact rather than ball to head contact (7).
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Concussion due to head impact is caused by forces that result in head accelerations – heading a ball results in head accelerations of less than 10g, whereas the minimum required for SRC is generally 40-60g. The average head-to-head impact is typically around 25-30g (8,9).
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Players that play in positions where heading is common also have an increased risk of head-to-head collisions, mostly in aerial duels (7).
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Heading the ball can result in sub-concussive impacts – and repeated heading can contribute to cognitive impairment as a separate risk factor to concussion (10).
Those numbers in parens are citations.