The difference between the two...
Transit Venus in the 5th House
When transit Venus is in your 5th house, the 5th house is the house of love, so this is a great time to begin dating a new special someone, and you won’t want it to be boring and blah. You feel more romantic, but in a playful way, and want some more drama in your love life (drama like you see on television and in movies; you want to recreate those incredibly romantic scenes).
Attracting new loves is easier during this transit, and
you’ll be the one getting chased rather than doing the chasing. You could meet someone through a hobby or who works in a creative field.
You feel more creative and artistic, and can find inspiration more easily. Dealing with your children may be easier, as well as getting in touch with your inner child.
Transit Venus in the 12th House
When transit Venus is in the 12th house, you don’t feel like being affectionate in public, and you may not come across as being all that interested in anyone. If you meet someone now, you’re more likely to keep your interest in them to yourself,
feeling more shy than usual in love matters. A relationship begun in secret is more likely to happen under this influence. You could feel a karmic attraction to someone, or be attracted to someone who you feel needs your help in some way. You may meet someone at a hospital, or who is a doctor, prison guard, warden, or drug counselor.
You find more pleasure in dealing with spiritual matters or the metaphysical, and you can have an easier time letting things go.
Transit Venus