Replies

"...these called for a constitutional amendment to abolish slavery nationally and permanently.
On December 14, 1863, a bill proposing such an amendment was introduced by Representative James Mitchell Ashley of Ohio.[14][15]
Representative James F. Wilson of Iowa soon followed with a similar proposal.
On January 11, 1864, Senator John B. Henderson of Missouri submitted a joint resolution for a constitutional amendment abolishing slavery.
The Senate Judiciary Committee, chaired by Lyman Trumbull of Illinois, became involved in merging different proposals for an amendment.
Radical Republicans led by Massachusetts Senator Charles Sumner and Pennsylvania Representative Thaddeus Stevens sought a more expansive version of the amendment.[16]
On February 8, 1864, Sumner submitted a constitutional amendment stating...
On February 10, the Senate Judiciary Committee presented the Senate with an amendment proposal..."
So notice the different terms used for virtually the same things:

"called for constitutional amendment"
"a bill"
"proposal"
"joint resolution"
"submitted a constitutional amendment"
"amendment proposal"
Sure, doubtless there do exist legalistic definitions for each of these, definitions which may be important in certain contexts, but I'm not sure why for layman's purposes they matter.

You might as well include a link and give proper credit to your Wikipedia source that you cut and pasted from:

https://en.wikipedia.org/wiki/Thirteenth_Amendment_to_the_United_States_Constitution

In the final years of the Civil War, Union lawmakers debated various proposals for Reconstruction.[13] Some of these called for a constitutional amendment to abolish slavery nationally and permanently. On December 14, 1863, a bill proposing such an amendment was introduced by Representative James Mitchell Ashley of Ohio.[14][15] Representative James F. Wilson of Iowa soon followed with a similar proposal. On January 11, 1864, Senator John B. Henderson of Missouri submitted a joint resolution for a constitutional amendment abolishing slavery. The Senate Judiciary Committee, chaired by Lyman Trumbull of Illinois, became involved in merging different proposals for an amendment.
Radical Republicans led by Massachusetts Senator Charles Sumner and Pennsylvania Representative Thaddeus Stevens sought a more expansive version of the amendment.[16] On February 8, 1864, Sumner submitted a constitutional amendment stating:

All persons are equal before the law, so that no person can hold another as a slave; and the Congress shall have power to make all laws necessary and proper to carry this declaration into effect everywhere in the United States.[17][18]

Sumner tried to have his amendment sent to his committee, rather than the Trumbull-controlled Judiciary Committee, but the Senate refused.[19] On February 10, the Senate Judiciary Committee presented the Senate with an amendment proposal based on drafts of Ashley, Wilson and Henderson.[20][21]

You copied and pasted a list of various proposals for Reconstruction. The proposals are characterized by the Wikipedia source as a bill, a constitutional amendment, a joint resolution, and an amendment proposal. While the article makes no claim that these things are the same, or virtually the same, if it makes you feel better to believe that a proposed constitutional amendment, a constitutional amendment, a joint resolution of Congress, and a bill are all virtually the same thing, I say go for it. Bless your heart.