No rule change for Mattis?

They're lining up to try to stop Mattis from becoming the Secretary of Defense.

"You can't just change the rules," they say. "It wouldn't be fair. It wouldn't be right."

I'm curious though, why didn't the same ban on rule changes apply in 2013, when Democratic leader Harry Reid changed Senate rules, unilaterally, to prohibit filibustering executive branch and judicial nominees? Changing the rules has a long and storied history. Below is a quick history of high-level "rule changes". Tell me again how we don't change the rules ...
2011	Majority Changes House Rules
1995	Strict Gift Restrictions Adopted
1987	Senate Rules Shape the Struggle for Power
1983	Democrats Make Changes in House Rules
1983	Changes in Senate Rules Recommended
1980	‘Sunset’ Legislation
1978	Sunset Legislation
1977	Senate Filibuster Rule
1974	House Rules Changes
1967	House Votes 233–185 to Repeal 21-Day Rule; Senate Defeats Move to Revise Cloture Rule
1967	House Rules
1966	House Rules
1965	Senate Cloture Rule
1965	House Rules Changes Enhance Majority Rule
1964	Senate Rules Changes
1963	Minor Senate Rules
1961	Senate Rules Unchanged
1959	Senate Rules Change
1957	Senate Rules
1955	House Committee Rules
1953	Senate, House Vote on Rules
1951	House Rules Change
1950	House Rules Change
1949	House Rules Change
1945	House Rules Committee