Yes. In fact, I just installed Ubuntu 14.04 LTS from scratch on a new computer and an old one. Both had pre-existing win 8.1. I tried both ways on these two machines and got the same 7.5 version. That is why I am totally confused.
If the network repo is enabled, installing cuda will install the latest cuda toolkit by design. Installing cuda-7-0 will install cuda 7.0, if it’s available in enabled repositories (local or network).