There are three different versions of Lumix 14-140mm stabilised lens. Version 1 is F4.0-5.8, Version 2 is F3.5-5.6 and Version 3 is also F3.5-5.6 but supports Dual IS on later Lumix cameras such as the GX85, G80, G9 and GH5, Version 3 is probably optically identical to Version 2.
My lens is Version 1, which I used extensively for studio and location shoots on my GH3. It is substantially heavier than the later Versions, but otherwise, I have never had any issues such as shutter shock on my GH3 with this lens. It's only failing is that over the time of my ownership, the lens zoom now has less friction and will extend when pointed downwards. For a 10X zoom, it's performance is very good for the kind of use I put it too, typically shooting at F8. I've been unable to produce shutter shock on any of my M43 Olympus or Lumix cameras past or present, which included the alleged 'enfant terrible' Lumix G7. I'm not saying it doesn't exist, I just have never seen it on my camera and lens combinations. In general, I'm happy to mix and match my camera bodies and lenses from both manufacturers.
I have never owned the Olympus 14-150mm lens so couldn't offer any valid comparison. If buying new, it probably makes sense to match the lens to its respective body make. Secondhand, the Lumix versions seem to be more readily available on the secondhand market but the Olympus is in the same ball park price wise.
The white diamond symbol on my EM1 Mk1 indicates that the electronic shutter has been selected, it will certainly stop any actual shutter shock but brings another raft of issues on such as moving subjects.