Different sizes of bow shocks
After a bit of searching in Aladin. I found that the other star is V* V2170 Ori.
By comparing their respective Simbad pages one can see the following:


LL Ori is actually slightly further away. 
V2170 Ori has a GAIA parallax of 2.84 while LL Ori has one of 2.55. Simply using $D=1/p$, this translates to a distance of 0.35 kpc and 0.39 kpc
LL Ori and V2170 Ori have about the same proper velocity of 1.65 and 1.69 mas/yr. So, that should affect the shock size. 
LL Ori is a lot brighter. 
It has an apparent V-Band magnitude of 11.5, while  V2170 only has 18.7. 
LL Ori is hotter.
Its spectral typ is K0-K3e, while V2170 is of spectral type M4.7e.


It is therefore not unexpected that LL Ori has a significantly stronger stellar wind and thus a larger bow shock.

Since the distance is basically the same, you can just have a look at this image with scale to estimate the size of the other bow shock.