DXA 1.4 comes with the SDL Web 8.1.1 CIL (Content Interaction Library). Is the 8.1.1 version of CIL compatible with the 8.1.0 CIS (Content Interation Serivces)?
To elaborate a bit on Nuno's Answer: the release dates were coordinated to ensure that DXA 1.4 could build upon CIL 8.1.1. We have also tested it against CIS 8.1.0, though.
Note, however, that there were several defects in SDL Web 8.1.0 which required hotfixes to make DXA 1.3+ work properly (in particular with XPM, see DXA 1.3 docs). These hotfixes have been included in 8.1.1, so I would strongly recommend to upgrade to 8.1.1.