HANA x86 1.0 migrations to HoP 2.0 LE and/or to HANA x86 2.0 via
HANA system replication have a serious “showstopper” if not validated
and done in the “correct” architecture

Replication is supported and allowed by SAP only when architecture
is same between source and target, regardless which server, x86 or
POWER.

HANA 1.0 SDC (single tenant) – > HSR to HANA 2.0 SDC (single tenant) -> upgrade to HANA 2.0 MDC

or

HANA 1.0 SDC (single tenant) -> upgrade to HANA 1.0 MDC (multi tenant) -> HSR to HANA 2.0 MDC

What is necessary, which issues can occur etc. has been written by
external consultant, Jens Gleichmann, XLC GmbH, in a sap blog:

https://blogs.sap.com/2019/01/20/hana-1.0-upgrade-scenarios/