We have others who try to say that different sins merit different responses even though such a thing has never been taught in the Gospel nor communicated by the Holy Fathers.
Canon 20 of St. John the Faster stipulates 5 years for voluntary murder, 3 years for involuntary murder, for those who follow through with the penance of not eating during the day, and only eating "dry foods" in the evening, and doing 300 prostrations daily; for those who do not follow that penance, then he directs them to Canon 56 of St Basil which says 20 years for voluntary and 10 for involuntary.
In the footnote, I also see noted the following (which I am summarizing, and will indicate V = voluntary, and I = Involuntary, and all numbers are years out of communion):
Canon 5 of St. Gregory of Nyssa: V 27, I 9
Canon 22 of Ancyra: V Life, Canon 23: I 7 or 5
Only for clergymen is the penance the same (deposition) regardless of intent.
Canon 21 of St. John the Faster gives 2 different prescriptions for women taking herbs to commit abortions: 5 or 3 years, and in the footnote it establishes a hierarchy of severity (listed lesser to worse) - those who take them monthly to prevent pregnancy, those who take them early or late in pregnancy, and those who are frequently pregnant and take them (it says monthly).
In another footnote to the same canon, it says that Canons 91 of Trullo, 21 of Ancyra, and 2 & 8 of St. Basil the Great call women who commit abortions on others (i.e. giving the herbs or potions) "voluntary murderers" but do not give them the same penance (life w/o communion), rather indicating 10 years w/o communion.
Heck, even in the Old Testament (Ex. 21 & 22) there are three punishments for killers: death for those who commit premeditated murder, "I will appoint for you a place where he may flee" for those who kill someone that "God delivered into his hand," and nothing for those who kill a thief during the break-in (if he pursues him and kills him, then he is treated as a premeditated murderer).