Republicans want stricter enforcement, but are not willing to accept the level of legalization and permissive treatment of migrants already in America that the Democrats would insist on. Democrats want that legalization and path to citizenship - but are unwilling to accept the level of border security and workplace inspections that the Republicans would insist on.

The 11 million undocumented immigrants within the United States are treated differently in the various bills. H.R. 2 does nothing on this issue. Both H.R. 3599 and S.744 provide paths to become documented. This is a major point of disagreement. Amnesty remains a hot button issue.

There are many points in agreement: E-Verify, more border fencing, more border security funding.

Dignity Act of 2023 (H.R. 3599)
Secure the Border Act of 2023 (H.R. 2)
The Border Security, Economic Opportunity, and Immigration Modernization Act of 2013 (S.744)

=== links ===
"A controversial issue in the United States is whether undocumented immigrants should be granted some form of amnesty."
Wikipedia: Amnesty - Wikipedia

Immigration Reform and Control Act of 1986
"While IRCA did not encourage illegal immigration, it failed to curb it... 'The Amnesty Effect: Evidence from the 1986 Immigration Reform and Control Act' found that the 'economic conditions in Mexico have the greatest impact on the flow of undocumented immigrants'"
en.wikipedia.org - Immigration Reform and Control Act of

Deferred Action for Childhood Arrivals
"In February 2018 the Senate considered four bills to offer legal protection to people who came to the United States undocumented as children, but all four bills failed to pass."
en.wikipedia.org - Deferred Action for Childhood Arrivals

DREAM Act
"In a December 2010 report, the federal Congressional Budget Office and the Joint Committee on Taxation estimated that the November 30, 2010 version of the DREAM Act would reduce (federal) direct deficits by about $1.4 billion over the 2011'2020 period and increase federal government revenues by $2.3 billion over the next 10 years... A study conducted by the Center for American Progress estimates that if passed, the DREAM Act would create 1.4 million jobs by 2030, primarily through the expected increase in educational attainment, earnings, and buying power for 'DREAMers'."
en.wikipedia.org - DREAM Act