Two PI systems in same SLD when upgrading PI 7.4

We are upgrading SAP Process Integration (PI) from 7.11 to 7.4 with option new installation and phase out. We are going from dual stack to single stack and will have the two PIs running parallel for a longer period.
Which are the issues we can run into using same System Landscape (SLD) for both PI systems?
We found that it is not possible to have two Business Systems (BS) connected to the same ABAP Technical System with the same client. Will it be possible to reuse the existing BS, which is then still connected to the PI 7.11, for PI 7.4?
WIll it be possible in production SLD to switch the Integration Server for backend ABAP BS?
How did you setup the SLD when new installation?
Best regards,
Maria S. L.

I've never tried that scenario ( two PI environments ->one SLD) but why don't you handle them separately as it's a new installation.
I believe you will be decommissioning existing PI landscape(SLD) post migration.
Don't change any SLD connections until you completely migrate to newer version of PI.
1) Export the SLD content from existing system to new system(TS,BS,SWCV etc)
2) In the back-end system maintain separate connections to required environment at interface level.
Refer to below blog to know how to maintain IS_URL paramter at interface level.
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/70066f78-7794-2c10-2e8c-cb967cef407b?overridelayout=t…
3) once you migrate all your interfaces change then change SLD pointers to new PI landscape.

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