90 Home Runs by two teammates. (Updated 10/6/2023)

Update 10/6/2023:

2023: Three Atlanta Braves hit at least 40 Home Runs: Matt Olson 54, Ronald Acuna, Jr. 41 = 95. And and Marcel Ozuna 40. Total: 135.

2021: Two Toronto Blue Jays: Vladimir Guerrero Jr. 48, Marcus Semien 45 = 93

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24 26 times. Maris and Mantle are the only teammates to hit at least 50 home runs in the same season. Ruth and Gehrig were the first to combine for at least 100. Ruth and Gehrig hit the most by teammates tied: 46 each in 1931. McGwire and Lankford had the biggest difference: 39. Fewest: 31 in 1998:
Lankford with McGwire's 70
Henry Rodriguez with Sosa's 66

Tot	Year	Team	First	Last	HR	First	Last	HR	Dif	franchName	franchID
115	1961	NYA	Roger	Maris	61	Mickey	Mantle	54	7	New York Yankees	NYY
110	2001	SFN	Barry	Bonds	73	Rich	Aurilia	37	36	San Francisco Giants	SFG
107	1927	NYA	Babe	Ruth	60	Lou	Gehrig	47	13	New York Yankees	NYY
101	1998	SLN	Mark	McGwire	70	Ray	Lankford	31	39	St. Louis Cardinals	STL
100	2002	TEX	Alex	Rodriguez	57	Rafael	Palmeiro	43	14	Texas Rangers	TEX
99	1999	SLN	Mark	McGwire	65	Fernando	Tatis	34	31	St. Louis Cardinals	STL
99	2001	TEX	Alex	Rodriguez	52	Rafael	Palmeiro	47	5	Texas Rangers	TEX
98	1998	SEA	Ken	Griffey	56	Alex	Rodriguez	42	14	Seattle Mariners	SEA
97	1998	CHN	Sammy	Sosa	66	Henry	Rodriguez	31	35	Chicago Cubs	CHC
96	1997	SEA	Ken	Griffey	56	Jay	Buhner	40	16	Seattle Mariners	SEA
96	2017	MIA	Giancarlo	Stanton	59	Marcell	Ozuna	37	22	Florida Marlins	FLA
93	1930	CHN	Hack	Wilson	56	Gabby	Hartnett	37	19	Chicago Cubs	CHC
93	1932	PHA	Jimmie	Foxx	58	Al	Simmons	35	23	Oakland Athletics	OAK
93	1996	SEA	Ken	Griffey	49	Jay	Buhner	44	5	Seattle Mariners	SEA
92	1931	NYA	Babe	Ruth	46	Lou	Gehrig	46	0	New York Yankees	NYY
92	2005	BOS	David	Ortiz	47	Manny	Ramirez	45	2	Boston Red Sox	BOS
91	1938	DET	Hank	Greenberg	58	Rudy	York	33	25	Detroit Tigers	DET
91	1965	SFN	Willie	Mays	52	Willie	McCovey	39	13	San Francisco Giants	SFG
91	2000	HOU	Jeff	Bagwell	47	Richard	Hidalgo	44	3	Houston Astros	HOU
90	1930	NYA	Babe	Ruth	49	Lou	Gehrig	41	8	New York Yankees	NYY
90	1997	COL	Larry	Walker	49	Andres	Galarraga	41	8	Colorado Rockies	COL
90	1999	SEA	Ken	Griffey	48	Alex	Rodriguez	42	6	Seattle Mariners	SEA
90	2001	ARI	Luis	Gonzalez	57	Reggie	Sanders	33	24	Arizona Diamondbacks	ARI
90	2006	PHI	Ryan	Howard	58	Chase	Utley	32	26	Philadelphia Phillies	PHI
	2017			max	73		max	54	39
	1927			min	46		min	31	0
				ave	56.2		ave	39.8	16.4

Duplicate years:
1997: 2
1998: 3
1999: 2
2001: 3

Multiple most HR:
Griffey 4
Ruth 3
McGwire 2
Alex Rodriguez 2

Multiple second most HR:
Gehrig 2, not counting his tie with Ruth
Buhner 2
Alex Rodriguez 2
Palmeiro 2

Teammates with at least 45 each sorted by HR2:

Tot	Year	Team	First1	Last1	HR1	First2	Last2	HR2	Dif	franchName	franchID
115	1961	NYA	Roger	Maris	61	Mickey	Mantle	54	7	New York Yankees	NYY
107	1927	NYA	Babe	Ruth	60	Lou	Gehrig	47	13	New York Yankees	NYY
99	2001	TEX	Alex	Rodriguez	52	Rafael	Palmeiro	47	5	Texas Rangers	TEX
92	1931	NYA	Babe	Ruth	46	Lou	Gehrig	46	0	New York Yankees	NYY
92	2005	BOS	David	Ortiz	47	Manny	Ramirez	45	2	Boston Red Sox	BOS

Duplicates for teams:
Yankees 4
Mariners 4
Giants, Cubs, Cardinals, Rangers 2

17 of the 24 pairs: high HR at least 52
9 of the 24 pairs: difference less than 9
9 of the 24 pairs: difference at least 22
11 of the 24 pairs: low HR less than 40