No, the ACA is NOT "Romneycare writ large", nor would make it difference if it were.

There were several Republican proposed alternatives to the ACA, among them:

http://www.politifact.com/truth-o-meter/article/2009/nov/05/gop-health-care-reform-simple-explanation/

http://www.factcheck.org/2010/02/still-on-the-table/

http://www.nytimes.com/2009/11/04/health/policy/04health.html

and there have since been updated and revised proposals.

The final product will support five goals, and it is likely the law will be debated and actually read before it is passed.

https://abetterway.speaker.gov/_assets/pdf/ABetterWay-HealthCare-PolicyPaper.pdf

1 - Repeal Obamacare

2 - Provide more choices, lower costs, and greater flexibility

3 - Protect our nation’s most vulnerable.

4 - Spur innovation in health care.

5 - Protect and preserve Medicare.