Being water-based does not make testosterone suspension suitable for sublingual use. A suspension contains drug particles dispersed in liquid; that doesn’t establish how reliably those particles will dissolve and absorb under your tongue.
Testosterone has been formulated specifically for absorption through the mouth, but those purpose-designed products are different from injectable suspensions. Buccal delivery—through the gum or cheek lining—is also distinct from sublingual delivery. medlineplus.gov
If your testosterone suspension is labelled for injection, don’t assume it can be substituted under the tongue. The absorbed amount and suitability of its ingredients cannot be determined from the water base alone.
The same caution applies to your Winstrol: using an injectable suspension under your tongue doesn’t establish that it is safe or reliably absorbed that way. Have a pharmacist check the exact products and their intended routes before continuing.